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Write a brief summary of a news article about renewable energy.

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A recent article discussed the potential of renewable energy sources, such as hydroelectric, solar and wind power, to help reduce greenhouse gas emissions and combat climate change. The article cited recent reports that show renewable energy sources are becoming more affordable and can provide up to 40% of the world's energy needs by 2050. The article also discussed the importance of implementing policies to support renewable energy development, such as tax credits and technology incentives, in order to make renewable energy sources more competitive with fossil fuels in the long run.